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Multiplex PCR detection of C. botulinum. Lanes: 1, molecular weight marker; 2, C. botulinum type A; 3, C. botulinum type B; 4, C. botulinum type E; 5, C. botulinum type F; 6, proteolytic C. botulinum types A, B, and F; 7, nonproteolytic C. botulinum types B, E, and F; 8, C. botulinum types A, B, E, and F; and 9, negative control.
